SB2026041413 - Use of Uninitialized Variable in Linux kernel netfilter

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Main Vulnerability Database SB2026041413

SB2026041413 - Use of Uninitialized Variable in Linux kernel netfilter

Published: April 14, 2026

Security Bulletin ID SB2026041413
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use of Uninitialized Variable (CVE-ID: CVE-2026-31428)

CWE-ID: CWE-457 - Use of Uninitialized Variable

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to uninitialized padding in the NFULA_PAYLOAD netlink attribute in nfnetlink_log when constructing packet messages for the NFLOG netlink socket. A local user can read the leaked padding bytes to disclose sensitive information.

The issue leaks stale heap contents to userspace when the payload length is not 4-byte aligned.


Remediation

Install update from vendor's website.

References